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Finding the Fourth Proportional to 415,072.45, 622,608.78 and 320,440.78

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Solution

The fourth proportional to 415,072.45, 622,608.78 and 320,440.78 is: 480,661.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    415,072.45 : 622,608.78 = 320,440.78 : x
  2. Step 2: Convert to fraction form
    415,072.45/622,608.78 = 320,440.78/x
  3. Step 3: Cross multiply
    415,072.45x = 622,608.78 × 320,440.78
  4. Step 4: Simplify right side
    415,072.45x = 199,509,243,098.05
  5. Step 5: Solve for x
    x = 199,509,243,098.05/415,072.45
  6. Step 6: Final answer
    x = 480,661.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.